/*
 * Copyright 2002-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Text;
using Spring.Core.IO;

namespace Spring.Objects.Factory.Xml;

/// <summary>
/// Centralised resource getter for loading all of those XML object
/// definition files used in the XML based object factory tests.
/// </summary>
/// <author>Rick Evans (.NET)</author>
/// <author>Erich Eichinger (.NET)</author>
public class ReadOnlyXmlTestResource : IResource
{
    private readonly IResource underlyingResource;
    private const string TestDataFolder = "Data";

    /// <summary>
    /// Creates a new instance of the
    /// <see cref="Spring.Objects.Factory.Xml.ReadOnlyXmlTestResource"/> class.
    /// </summary>
    /// <param name="fileName">
    /// The filename/resourcename (e.g. foo.txt) of the XML file containing the object
    /// definitions.
    /// </param>
    public ReadOnlyXmlTestResource(string fileName)
    {
        if (ConfigurableResourceLoader.HasProtocol(fileName))
        {
            ConfigurableResourceLoader loader = new ConfigurableResourceLoader();
            underlyingResource = loader.GetResource(fileName);
        }
        else
        {
            underlyingResource = new FileSystemResource(fileName);
        }
    }

    /// <summary>
    /// Creates a new instance of the
    /// <see cref="Spring.Objects.Factory.Xml.ReadOnlyXmlTestResource"/> class.
    /// </summary>
    /// <param name="fileName">
    /// The filename/resourcename (e.g. foo.txt) of the XML file containing the object
    /// definitions.
    /// </param>
    /// <param name="associatedTestType">
    /// The <see cref="System.Type"/> of the test class utilising said file.
    /// </param>
    public ReadOnlyXmlTestResource(string fileName, Type associatedTestType)
        : this(ReadOnlyXmlTestResource.GetFilePath(fileName, associatedTestType))
    {
    }

    public IResource CreateRelative(string relativePath)
    {
        return this.underlyingResource.CreateRelative(relativePath);
    }

    public bool IsOpen
    {
        get { return this.underlyingResource.IsOpen; }
    }

    public Uri Uri
    {
        get { return this.underlyingResource.Uri; }
    }

    public FileInfo File
    {
        get { return this.underlyingResource.File; }
    }

    public string Description
    {
        get { return this.underlyingResource.Description; }
    }

    public bool Exists
    {
        get { return this.underlyingResource.Exists; }
    }

    public Stream InputStream
    {
        get { return this.underlyingResource.InputStream; }
    }

    public static string GetFilePath(string fileName, Type associatedTestType)
    {
        if (associatedTestType == null)
        {
            return fileName;
        }

        // check filesystem
        StringBuilder path = new StringBuilder(TestDataFolder).Append(Path.DirectorySeparatorChar.ToString());
        path.Append(associatedTestType.Namespace.Replace(".", Path.DirectorySeparatorChar.ToString()));
        path.Append(Path.DirectorySeparatorChar.ToString()).Append(fileName);

        FileInfo file = new FileInfo(path.ToString());
        if (file.Exists)
        {
            return path.ToString();
        }
        else
        {
            // interpret as assembly resource
            fileName = "assembly://" + associatedTestType.Assembly.FullName + "/" + associatedTestType.Namespace
                       + "/" + fileName;
            return fileName;
        }
    }

    public override string ToString()
    {
        return Description;
    }
}
